Lately we had several projects with big number of Diffs. It became a problem to select Diffs that have problems from all others with false positives. For this we have developed possibility to "star" some of the diffs so you can come back to them later.
In order to use this featuer just click on the star icon right above the diff image
Then on the Diff's listing page you can see new tab "starred'. This is where you can review marked items afterwards.
Hope you will enjoy this feature. Let us know what do you think!